Nice presentation you gave at our PSAS meeting, Jon. Setting NSW constituants at unity, then showing how different methods of water husbandry makes the constituants in our tank water differ from unity was a good way to explain it for me to understand what you were saying. Hope you'll come back and participate in threads, especially in water chemistry-related threads. I appreciate the WM products you sent me and are using them. I'm trying to compare, at least subjectively, how the WM CaOH2 compares to the food grade lime I've used in the past. At a minimum, I can say that the excess WM "kalk" left over is whiter than the residue from food grade lime I've been using.